This property specifies the formats of dates and times for the
appearances of fields that use javascript functions such as
AFDate_FormatEx, AFTime_FormatEx.
A null value indicates the use of the locale-independent default formats.
You can see the appearances when the PDF is rendered to an image.
If the fields are not stamped, Adobe Reader may ignore the appearances
and generate new appearances so you may not see the dates and times
in the specified formats when viewing in Adobe Reader.
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